P0191 Fuel rail pressure sensor circuit range/performance (bank 1)
What P0191 means
The fuel rail pressure sensor tells the engine computer how much pressure is in the injector rail. P0191 means its reading is out of the expected range for the operating conditions, or does not respond as expected. The sensor may be faulty, or the fuel pressure itself may really be wrong.
P0191 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 80–300 €
- Workshop time
- 1–6 h
- Repair difficulty
- Hard
- DIY possible
- No
- Check engine light
- Yes
- Affects emissions test
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Check engine light on
- Hard starting or long cranking
- Reduced power or limp mode
- Hesitation or stalling
Common causes
- Faulty fuel rail pressure sensor
- Corroded or loose sensor connector
- Low fuel supply from a weak pump or clogged filter
- Faulty pressure regulator or high-pressure pump
- Damaged wiring
Can I keep driving with P0191?
You can drive, but have it checked within one or two weeks. If the engine loses power or stalls, get it checked sooner.
What to check first
- Compare rail pressure with the engine off; it should drop close to zero
- Compare commanded and actual rail pressure at idle and under load
- Check the sensor connector and wiring
- Measure fuel pressure with a gauge to confirm whether the sensor or the fuel system is at fault
Related codes
- P0190 Fuel rail pressure sensor circuit (bank 1)
- P0192 Fuel rail pressure sensor circuit low (bank 1)
- P0193 Fuel rail pressure sensor circuit high (bank 1)
- P0181 Fuel temperature sensor A range/performance
- P0175 System too rich (bank 2)
- P0174 System too lean (bank 2)
- P0173 Fuel trim malfunction (bank 2)
- P0172 System too rich (bank 1)
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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